but mrs. obama says, she never knows when i'm going to walk into her room and see what she's texting. parents are parents, no matter what. >> no question about it. we can't wait to see all of it tonight. thank you, barbara, on "20/20." christmas at the white house, at 10:00, 9:00 central, right here on abc. >>> now, let's go to sam for the weather. >> we're going to start with pictures out of san diego. just finished their wettest day in two years. getting an inch and a half in rain in san diego, doesn't sound like a lot to a lot of folks. but that's their monthly total for december. that's their average. three inches of rain around that san diego area. and it's one, two, three wet systems that move across the coastline, dropping down and moving across the country. that's the one that moved through yesterday. this is tonight's. and then there's another one that comes through by the time we get to saturday night. that puts a lot of moisture across the middle of the country for this weekend. we